An asteroid orbiting backward out near Jupiter actually hails from another star system...

China has launched a relay satellite as part of a groundbreaking program to land a probe on the far side of the moon this year...

Warnings that Hawaii's Kilauea volcano could shoot boulders and ash out of its summit crater are prompting some to cancel their plans to visit the Big Island...

NASA says Mars-bound Insight spacecraft on its way to red planet, along with two little sidekicks....

Two briefcase-size satellites named WALL-E and EVE are zooming toward Mars with a Martian lander launched from California...

NASA launches InSight spacecraft bound for Mars; lander will explore mysterious insides of the red planet...

NASA launches InSight spacecraft bound for Mars, lander will explore mysterious insides of the red planet...

NASA's next Mars explorer is going to have company all the way to the red planet...

When NASA astronaut Joseph Acaba went out for a spacewalk during a recent trip to space, he held on tight to the railing...

The European Space Agency has released the first image taken by its Trace Gas Orbiter showing the ice-covered edge of a vast Martian crater...